Efficiency study of germanium-detector-based Compton telescopes

Hung-Hsiang Liang^1*, Yi-Chi Chang¹, Chien-Ying Yang¹, Che-Yen Chu¹, Jeng-Lun Chiu², Chih-Hsun Lin³, Yuan-Hann Chang⁴, Hsiang-Kuang Chang^1,5

¹Institute of Astronomy, National Tsing Hua University, Hsinchu, Taiwan
²National Space Organization, National Applied Research Labs, Hsinchu, Taiwan
³Institute of Physics, Academia Sinica, Taipei, Taiwan
⁴Department of Physics, National Central University, Taoyuan, Taiwan
⁵Department of Physics, National Tsing Hua University, Hsinchu, Taiwan

* Presenter:Hung-Hsiang Liang, email:sean49178840@gmail.com

Multi-Layer germanium Compton telescopes are promising design for MeV gamma-ray astrophysics. The determination of the sequence of Compton scatterings in the detector volume is crucial to the reconstruction of the incoming photon direction and its energy. We compared the efficiency of some different configurations of germanium detectors, combining advantages of compact germanium-detector arrays and time-of-flight information of the Compton scattering sequence. We conducted Monte-Caro simulations to estimate the efficiency of these different configurations. The configuration with the highest efficiency will be the design concept of the Compton Imager and Spectrometer (CIS), which is aiming at a future small-satellite mission.

Keywords: Compton Telescope, Germanium Detector, MeV Gamma-ray Astrophysics